29 January 1965
Vol 147, Issue 3657

About The Cover

Part of a tail feather from an adolescent male lyrebird. Usually, the transformation process occurs simultaneously on both sides of the rachis both barbs and barbules being lost. When this feather was molted, however, loss of barbules was proceeding mainly on the left side (X 4). See page 510. [L. H. Smith, National Parks, Bicroria, Australia]